2021 Lexus RC 300 — Full Specifications
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The 2021 Lexus RC 300 is a coupe offered with 2 engines (2L 4-cyl turbo, 3.5L 6-cyl). Its most fuel-efficient configuration returns around 30 mpg (UK) / 25 mpg (US EPA) combined, with 26–30 mpg (UK) across all configurations. Owners often keep a Lexus RC 300 workshop manual to hand for servicing and repairs.
Compared with the 2020 Lexus RC 300: Fuel economy is essentially unchanged at around 30 mpg (UK) combined. The engine line-up listed by EPA is unchanged.
Full Specifications
| Engine (most efficient) | 2L 4-cyl turbo |
|---|---|
| Engine options | 2L 4-cyl turbo · 3.5L 6-cyl |
| Transmission (most efficient) | Automatic (S8) |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | Rear-Wheel Drive |
| Body Style | Coupe |
| Passenger Volume (EPA) | 84 cu ft (2,379 L) |
| Luggage Volume (EPA) | 10 cu ft (283 L) |
| Fuel Economy (UK) | 30 combined / 25 urban / 37 extra-urban mpg |
| Fuel Economy (US EPA) | 25 combined / 21 city / 31 highway mpg |
| CO₂ Emissions | 222 g/km |
| EPA Greenhouse Gas Score | 4 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $3,300 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2021 Lexus RC 300 across 2 engines (2L 4-cyl turbo, 3.5L 6-cyl). Combined fuel economy ranges from 22 to 25 mpg (US), or 26 to 30 mpg (UK), depending on engine, transmission and drive. The headline figures at the top of this page describe the most fuel-efficient configuration.
| Engine | Transmission | Drive | MPG (UK) | MPG (US) | CO₂ g/km | Fuel cost / yr |
|---|---|---|---|---|---|---|
| 2L 4-cyl turbo | Automatic (S8) | Rear-Wheel Drive | 30 | 25 (21/31) | 222 | $3,300 |
| 3.5L 6-cyl | Automatic (S6) | All-Wheel Drive | 26 | 22 (19/26) | 253 | $3,750 |
MPG (US) shows combined, with city/highway in brackets. Highlighted row = the configuration used for the headline figures. Source: US EPA fueleconomy.gov.
EPA measures interior passenger volume at 84 cubic feet (about 2,379 litres) and luggage volume at 10 cubic feet (about 283 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2021 Lexus RC 300
Running Costs: 2021 Lexus RC 300
Covering around 8,000 miles a year in a 2021 Lexus RC 300 at 30 mpg combined, expect roughly 1,212 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $3,300 a year in fuel for the most efficient configuration (15,000 miles, national average prices). Work out exact fuel costs with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Only need this car occasionally? See our buy vs rent comparison.
2021 Lexus RC 300 Safety Ratings (NHTSA)
No NHTSA crash-test rating is on record for this model year. The NHTSA rates only a subset of vehicles each year; you can browse every rated vehicle on our NHTSA Safety Ratings hub.
How It Compares
How does the Lexus RC 300 compare to similar coupes? For context, coupes in our database average around 25 mpg (UK) combined — this model's 30 mpg figure is 5 mpg better than that average. Its 222 g/km CO₂ figure is 56 g/km lower than the 278 g/km average for coupes on this site. This comparison is based on 1072 coupes in our dataset.
Lexus models in our database average about 28 mpg (UK) combined on their most efficient configuration; the 2021 Lexus RC 300's 30 mpg is 2 mpg above that make average. Its 222 g/km CO₂ figure is 30 g/km lower than the 252 g/km Lexus average.
Of the 10 Lexus RC 300 model years we cover, the 2021 ranks 2nd for combined fuel economy on its best configuration (30 mpg UK combined, against a high of 31 mpg). See every Lexus RC 300 year side by side.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 2026
Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.
Recommended Accessories for the 2021 Lexus RC 300
Frequently Asked Questions
What engine does the 2021 Lexus RC 300 have?
EPA lists 2 engines for the 2021 Lexus RC 300: 2L 4-cyl turbo, 3.5L 6-cyl. The most fuel-efficient configuration pairs the 2L 4-cyl turbo with a automatic (s8).
What is the fuel economy of the 2021 Lexus RC 300?
The most efficient configuration returns around 30 mpg (UK) combined, or 25 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 26 to 30 mpg.
How much does the 2021 Lexus RC 300 cost to fuel per year?
The US EPA estimates about $3,300 a year in fuel for the most efficient configuration, based on 15,000 miles of mixed driving and national average fuel prices. Your own cost will depend on mileage and local prices.
How much interior and luggage space does the 2021 Lexus RC 300 have?
EPA measures interior passenger volume at 84 cubic feet (about 2,379 litres) and luggage volume at 10 cubic feet (about 283 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.
Is the Lexus RC 300's fuel economy good for a coupe?
Yes — it returns around 30 mpg (UK) combined, against a same-body-style average of roughly 25 mpg among the coupes we track, making it one of the more efficient options in its class.